Yes that gauge will work..... Any tank LARGER than a #1(disposable) that has a standard POL/OPD valve which is industry standard for tanks up to #100 or maybe larger will accept that gauge.
The problem with the gauge is Propane being a LP gas, the pressure in tank is temperature dependant. If its really a cold morning tank may read like 70psi (low?) as day heats up pressure may go up to 145 psi (full?)... The gauge will only really be accurate just before you actually go empty when there is actually little or no LIQUID in tank to boil off to vapor... Usually a gauge will read full for a long time then rapidly swing to empty (because of pressure/temperature dependency) it could actually happen in course of a single day of usage so it really does not give you any warning. It is not like fuel gauge in car which registers fuel used or remaining...
Easy way to tell how much liquid is in tank is to boil a quart or two of water... Then dribble it slowly over side of tank.... It will warm area of tank above liquid level, by running hand down tank side you can feel level where liquid is, that is most accurate method of "field" testing tank.... Its the liquid level that is indicator of how full tank actually is.
Other method is to weigh tank. Propane weighs in about 4.7 pounds to gallon so after subtracting tank weigh, the remain weight is amount of fuel in tank... Tare weight of tank should be stamped in safety rig of tan... A #20 tank (about 4.7 gallons) weighs in about 18-20 pounds empty (tare), and about 37-38 pounds full.... So a #5 tank contains about 1 gallon of fuel when full, a #11 tank contains about 2 gallons of fuel when fuel a #14.5 is about 3.5 gallons when full ... But who takes scales camping with them....
Other option to see how full tank is may be one of these...
http://www.buytikitorches.com/category/ ... ccessories
Tad bit expensive for me though....
Dale
Lives his life vicariously through his own self.
Any statement made by me are strictly my own opinion.
You are free to ignore anything I say if you do not agree.